# include<stdio.h>
# include<math.h> 
int main()
{
double a,b,c, disc,x1,x2,p,q;
scanf("%lf%lf%lf",&a,&b,&c);
disc=b*b-4*a*c;
if(disc<0)
printf("This equation hasn't real roots\n"); 
else
{
    p=-b/(2.0*a);
    q=sqrt(disc)/(2.0*a);
    x1=p+q;x2=p-q;
    printf("real roots:\nx1=%7.2f\nx2=%7.2f\n",x1,x2);
}
return 0;
}